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1 Install Haskell

Haskell, like most other languages, comes in two flavors: batch oriented
(compiler) and interactive (interpreter). An interactive system
gives you a command line where you can experiment and evaluate
expressions directly, and is probably a good choice to start with.

While both GHC and Hugs work on Windows, Hugs has perhaps the best
integration on that platform. Nonetheless, GHC is more actively developed and maintained, and the consensus seems to be that it is the generally-recommended environment of choice for newcomers to Haskell as well as old hands. There is also information available on
installing Haskell software on Mac OS X.

2 Start Haskell

Open a terminal. If you installed GHC, type ghci (the name of the executable of the GHC
interpreter) at the command prompt. If you installed Hugs, type hugs.